A performance analysis of CSMA based broadcast protocol in VANETs.

Nguyen Tien Viet 1 François Baccelli 2, 3, 4 Kai Zhu 5 Sundar Subramanian 6 Xinzhou Wu 6
4 DYOGENE - Dynamics of Geometric Networks
DI-ENS - Département d'informatique de l'École normale supérieure, ENS Paris - École normale supérieure - Paris, Inria Paris-Rocquencourt, CNRS - Centre National de la Recherche Scientifique : UMR8548
Abstract : The broadcast of periodic messages is a key functionality in vehicular ad hoc networks. In the emerging vehicular networks, IEEE 802.11p is the standard of choice to support the PHY and MAC layer functionalities. The broadcast process in IEEE 802.11p is based on the CSMA mechanism where a device transmitting a packet senses the channel for ongoing transmissions and performs a random back-off before accessing the channel. Without RTS/CTS mechanisms, carrier sensing is expected to provide a protection region around the transmitter where no other transmitters are allowed. The point process characterizing the concurrent transmitters is expected to enforce a minimum separation between concurrent transmitters. However, at increasing densities, the CSMA behavior breaks down to an ALOHA-like transmission pattern where concurrent transmitters are distributed as a Poisson point process, indicating the lack of protection around transmitters. In this paper, we model the CSMA mechanism as a slotted system and analytically characterize the critical node/packet arrival density where the CSMA mechanism approaches an ALOHAlike behavior. Further, we use tools from stochastic geometry to establish closed-form expressions for the performance metrics of the broadcast mechanism in the ALOHA regime. Finally, using ns2 (an unslotted asynchronous simulator), we compare the theoretical results with simulations
Type de document :
Communication dans un congrès
INFOCOM 2013 - 32nd IEEE International Conference on Computer Communications, Apr 2013, Turin, Italy. IEEE, INFOCOM, 2013 Proceedings IEEE, pp.2805-2813, 2013, 〈http://infocom2013.ieee-infocom.org/〉. 〈10.1109/INFCOM.2013.6567090〉
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https://hal.inria.fr/hal-00940553
Contributeur : Fabien Mathieu <>
Soumis le : samedi 1 février 2014 - 18:44:50
Dernière modification le : mardi 17 avril 2018 - 11:23:50

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Nguyen Tien Viet, François Baccelli, Kai Zhu, Sundar Subramanian, Xinzhou Wu. A performance analysis of CSMA based broadcast protocol in VANETs.. INFOCOM 2013 - 32nd IEEE International Conference on Computer Communications, Apr 2013, Turin, Italy. IEEE, INFOCOM, 2013 Proceedings IEEE, pp.2805-2813, 2013, 〈http://infocom2013.ieee-infocom.org/〉. 〈10.1109/INFCOM.2013.6567090〉. 〈hal-00940553〉

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